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Unread 02-07-2013, 06:10 PM   #1
Ray VanBuren
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1979 J-Series Truck 
 
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Fuel issue

I would like to pick ya'll's brain here. I have a '79 J-10 w/360 engine. I have replaced the carb(new),fuel filters, fuel pump(twice), fuel lines, fuel pickup, and gas tank. Now, it will run until the fuel bowl is empty. I have checked for leaks, sucking air, etc. but can't solve this issue. Any ideas?

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Unread 02-07-2013, 07:41 PM   #2
RockRollin
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What fuel filter do you have? If it has the return line coming off of it make sure its in the 12 o clock position. Have you done a flow check on the fuel system?
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Unread 02-08-2013, 05:50 AM   #3
PITA88FSJ
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I'm not sure if your has the 7" piece of rubber fuel line on the return just above the rear of the transfer case. My was rottred and caused some fuel problems.

RockRollin, what is the reason for having the return line in the 12 o'clock position? I just changed mine out and it's at the 10 position. Want to make sure I get everything right.
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Unread 02-08-2013, 07:29 AM   #4
Ray VanBuren
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Quote:
Originally Posted by RockRollin View Post
What fuel filter do you have? If it has the return line coming off of it make sure its in the 12 o clock position. Have you done a flow check on the fuel system?
I have a return line in 12 o clock position.
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Unread 02-08-2013, 07:30 AM   #5
Ray VanBuren
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Quote:
Originally Posted by PITA88FSJ View Post
I'm not sure if your has the 7" piece of rubber fuel line on the return just above the rear of the transfer case. My was rottred and caused some fuel problems.

RockRollin, what is the reason for having the return line in the 12 o'clock position? I just changed mine out and it's at the 10 position. Want to make sure I get everything right.
Mine does and all the lines are new.
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Unread 02-08-2013, 07:52 AM   #6
olliehopnoodle
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There are some who believe the return line must be in the 12 o'clock position on the fuel filter. This is not an absolute requirement for the truck to run. Mine is currently in the 10 o'clock position and I drive it around all of the time.

I always poo poo'd folks who insisted 12 o'clock is a 'must'. However, one thought on the subject does make sense to me. If you have vapor lock issues the 12 o'clock position might allow vaporized fuel to be pushed out the return line and help avoid issues. I have not tried this yet. I only have vapor lock issues once a year driving to/from Ouray (specifically Gallup to Ship Rock and back). So next year I will test this out.
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Unread 02-08-2013, 08:17 AM   #7
RockRollin
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Ollie your right IMO , but it is a self bleed design. Its not mandatory, but it could be an issue. Picture it pointing up and return in the 6:00 position, you could could be getting no fuel at all. Its just another to check. Step one. Do a flow check before the filter,
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Unread 02-08-2013, 12:09 PM   #8
olliehopnoodle
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It can't hurt to have it a 12 oclock.
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Unread 02-09-2013, 06:32 AM   #9
PITA88FSJ
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Thanks for the info...gonna rotate mine today as it is in the 9 o'clock position. No problems, but better safe than sorry.
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Unread 02-09-2013, 10:08 AM   #10
Ray VanBuren
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I finally found the problem. There was bits of rubber in the needle valve area from past(before replacement) fuel line. Cleaned up and running like a champ. Also replaced all the fuel filters. Thanks for all the responses.
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Unread 02-09-2013, 10:43 AM   #11
RockRollin
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